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M672061H Datasheet(PDF) 1 Page - ATMEL Corporation

Part No. M672061H
Description  Empty Flag Parasitic Pulse
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Maker  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
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M672061H Datasheet(HTML) 1 Page - ATMEL Corporation

   
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4425B–AERO–01/06
Active Errata List
• Reading Errors
• Empty Flag Parasitic Pulse
Errata History
Errata Description
1.
Reading errors.
Description
Sometimes a bit that has been written "1" is read "0".
Failure Conditions
1.
Read and write commands fall down almost at the same time, t
WLRL
parameter in the hereunder table.
2.
Write bit “0” on input port while a bit “1” is expected on output port.
3.
Reading the 64
th+1
(mod 64) location (16
th +1
(mod 16) for 4Kx9 FIFO) vs. the
writing location.
4.
Read pulse (t
RLRH) less than the one specified in the hereunder table.
Root Cause
The memory array of the 16Kx9 FIFO contains 64 columns, the 4Kx9 contains 16
columns. To reduce the read access time, a pipe line has been implemented on
the data path. When the data
n is going out of the FIFO, the datan+1 is pre-
fetched for the next read access. When the internal writing and reading are dif-
ferent from 64
(mod 64) (16 (mod 16) ), a write and a read access are made on the
same column. Coupling between the read bit-line and the write bit-line only dis-
turbs the pre-fetch operation, forcing the sense amplifier to output “0”. Then, the
next external reading may be wrong.
Characterization
Worst case condition: 125°C / 4.5V
Lot Number
Errata List
M67206H, M672061H, M67204H all lot numbers
1, 2
tWLRL
t
RLRH
minimum
maximum
67206H /
672061H
≥ 0 ns
≤ 8 ns
≤ 30 ns
67204H
≥ -2 ns
≤ 8 ns
≤ 25 ns
WR
RD
I
n
Q
n
“0” read
“1” expected,
“0” written
H.Z
H.Z
t
WLRL
t
RLRH
Writing Data
n
Reading Data
n+64+1(mod 64)
(n+16+1(mod 16))
Radiation
Tolerant FIFOs
M67206H
M672061H
M67204H
Errata Sheet


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